Spirit yaks are farm animals which can be obtained by making pack yak pouches[1] or by breeding two yaks in the breeding pen. Currently players must have a free inventory space to receive a spirit yak whilst creating pouches.[2]

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References

^Jagex. Mod Rowley's Twitter account. 7 September 2018. (Archived from the original on 7 September 2018.) Mod Rowley: "If going for a spirit yak from crafting pack yak pouches, make sure to keep an inventory space clear. Hopefully, we can get this changed so it replaces a pack yak pouch (like golden rocks do) at some point (but it won't be ahead of this weekend)."